They occurred then.
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At most one of the events can occur.
Equally likely events.
Yes, they are. Mutually exclusive events cannot occur together. Complementary events cannot occur together either because an event and its complement are the negative of each other.
We would need to know which events you're referring to to respond to this question.
No, if two events are mutually exclusive, they cannot both occur. If one occurs, it means the second can not occur.